PACKAGE DISPUTE - quick to deduct money, slow to sort problems

I was phoned about 2 months ago by a Vodacom agent. She had informed me that my current package does not exist and needs to be upgraded to a different package and that I will only be paying a monthly fee of around R388.00 and not my current fee of R419. (her words were that I will not be paying anything extra). She advised that I will be migrated from the RED 50MB 50min - Top Up to a different package, the 100 min Top up. Now I have been charged a fee of R598.00 per month. I did not agree to this. I have been struggling since early October to get this sorted and every time the call center agent really does try to help but no one is getting back to me as promised. This issue is not being resolved and now I am invoiced for the R598 again for deduction in December. I am really upset that I joined Vodacom at all. If I could give you 0 stars, that would be suited!!